Vehicle luting jack



Resales-Feb. 12, v193s l1e,19,465,v

vLrlvi'iiaoSTATES PATENrioI-FICE Louis c. stnkenborg, Memphis, Tenn., assigner te Oildraulie Litt Company, Memphis, Tenn., a corporation of Delaware i originel Ne. 1,803,682, dated May 5, 1931, Serna No. 250,468, January 30, 1928. Application for reissue January 20, 1933, Serial No. 653,910

. 1.o claims. "(cl. eso- 52) This invention relates to an improved fluid the piston 16 so that preferably no portion therepressure actuated lifting jack and has especial of extends above the upper end oi the piston 16. relation to the piston or ram and the fluid actuat- 28 are bosses extending laterally on opposite sides ing and control means associated therewith. of the motor, into which bosses cap screws 29 may Among the objects of my invention is to provide be secured, to suspend the motor within the 5 an improved ram in which all the moving and piston 16. actuating parts are assembled in a single com-l 30`is an angle valve, the inlet extension 31 of pact unit. which may be secured through a suitable hole The means by which the foregoing and other tapped through the head 18 of the piston, which lo objects are accomplished and the manner of their valve forms a bleeder to allow the return of the m accomplishment will readily be understood from fluid from the cylinder'to the interior of the the following specification on reference to the piston.. From thisvalve, a control stem 32 leads accompanying drawing in which: to the upper end of the piston.l Preferably this Fig. l is a sectional elevation taken on the Stem is connected to the stem of the valve` 3G by a 35 approximate center line of the cylinder and sleeve 33 similar to the sleeve 24 hereinbefore g5 preferably provided with a threded me 22 without encroaching on the'motor or within that piston, showing 9. preferred form of control. described. The upper end of the stem 32 may be Fig. 2 isa' similar elevation of the lower end of provided with a, bevel gear 34 and a similar bevel the cylinder and piston showing a, minor modigear 35 be used in connection therewith, whereneation in the pump kmounting thereof. by e laterally extending operating rod 36 may be 2g Fig. 3 is e. sectional elevation of the upper end used to operate the valve from an exterior point. 20 of the piston taken at right angles to the view lf desired, a check valve 37 may he used to shown in Fig. l. prevent return ow of the iiuid through the pump. Referring now to the drawing in which the Shouid'it be desiredacontinuation 38 of the piston various parts are indicated by numerals, l0 is a may be Carried belW the head 13 l0 form a StGB 25 vertical cylinder having a closed bottom 11 and for the piston in its descent and to thereby pro- 25 provided intermediate its height with a guiding tect the pump.

ring 12 and near the upper end with a guiding The chamber or pocket thus formed also serves y ring 13 forming also the lower portion of a stuiito trap air which may be carried into the cylinder ing box, which stumng box is provided with suitwhen the piston is being raised and to hold same 30 able packing 14, held in place by a packing gland in convenient proximity to the release valve, so 30 15. Disposed within the cylinder 10 is a hollow that such air on the descent of the piston is carpiston or ram i6 to the upper end oi which a liitried into the piston reservoir and there released. ing head 17 oi any desired form may be secured. in order to limit the vertical lift of the piston, The lower end of the hollow piston is closed by" only such amount of fluid 'is piace@ @herein as 3 nWhCh the lifting udypl'efelably 0n, is a'leddesired height, so that the distance which the,

19 is a pump Secured to the' head 13 eitheras piston will lift, will thereby be automatically regu- 223m z'tgleurggeg lated without mechanical stops of any kind,

40 provided with an met 20 directly'connected with whether the pump 'and motorbe cut oi at the time or not. 40 the interior or the piston 1s, and with an outlet proper 21 leading from the pump to the interior of the The motor 27 is placed at the top of the piston in order that v'che liquid'level may he kept below c lmder 10 outside the iston 16.

ym the form shownpin Fig 1 the pump is the motor, and such regulatmn accornphshed which may be Secured directly mtg the head 13 portion of the piston in which the available of the piston and in such case the pump inlet is liquid area iS S0 Serillsly diminished by the preferably led directly through this me as is motor as to make such regulation impracticable. indicated m that v1ew By associating the pump and motor with the 5o 23 is the pump shaft, which is preferably propiston and especially by placing the pump at the vided with. a sleeve 24 secured thereto as by a P01111; 0f dishrge imm the Piston illtO the cylthrough pin into which sleeve the squared lower V1116421' the 00115101 1S greatly Simplified and imend 25 ot the motor shaft 26 may be slipped. 2'? proved- The PaSSaECWBYS fOr the 110W of the indicates an electric motor used for driving the liquid are reduced in length and angles or elbows pump. This motor is disposed entirely within are avoided.- In addition the shipping and 5,5

a head 13 and the DStOl iS utilized 8S reservoir will, when completely used raise the piston to the 35 y assembly of the pump is greatly facilitated and in every way the control improved.

In using the device the cylinder is ordinarily set in the ground with its upper end approximately level with the surface thereof. 'I'he piston assembly is then placed therein and the stuffing box gland tightened. I'he cylinder may be then .supplied with the proper amount of fluid, the

motor wired up in the usual manner and the device is ready for use.

jTo operate the-jack. the bleeder valve 30 is closed. the motor 27 started and allowed to run until all the fluid is pumped from the piston into the cylinder after which the motor is preferably shut olf. The piston will thereafter remain at such level until the bleeder valve is opened and it is again allowed to sink by gravity to its inmsi position Y:us

should a be desired to stop the piston in its `upward stroke at any desired point, itis only necessary to shut the motor off when such position is reached. Should it be desired to stop the piston in its downward motion it is only necessary to close the bleeder valve when such position of descent has been reached, as is desired.

It will be understood that the drawing and description herein is illustrative only and that the details herein mentioned may be deviated from except as they may be hereinafter set out in the claims. y

Having described my invention, what I claim 1. In a lifting Jack, a vertically disposed hollow cylinder and a self contained lifting unit vertically movable therein, said unit comprising a tubular piston provided with a closure adjacent but spaced above its lower end and adapted to contain a lifting fluid, a pump carried by said closure and having its shaft centrally aligned thereby, said pump having parts projecting below said closure but terminating above the lower end of the piston, a motor carriedv by the upper end of said piston and having its Shaft posltionedby saidpiston in axial alignment with said pump piston whereby'the pump is housed within said chamber and the lower end of the piston acts as a lower limit stop to protect the pump lfrom injury, an intake Yfor said pump within said piston. an outlet for said Iivump exterior to said piston and within said cylinder, a motor carried by said piston an'd operatively connected with said pump and a manually operable release v alve .connecting said and the interior of said piston, t0 control release flow between `the exterior of said piston and the interior thereof independent of 'said pump.

3. In a lifting Jack, a vertically disposed hollow cylinder, and a self-contained lifting unit Yvertically. movable therein, said unit comprising a hollow plunger closed'V at its lower end and adapted to contain a lifting fluid, a pump cunted on and secured to said closed end, said lpump havinganintakewithinssidplungenan Ioutlet' into said cylinder, and having a shaft extending vertically -upward within?, and aligned by said plunger; a motor carried by the upper end of said plunger and having its shaft extendf ing downwardly within and positioned by said plunger in alignment with said pump shaft. and coupling means for eifecting driving engagement between said motor and said pump, saidcoup'ling means being engageable by placement of said motor and disengageable by removal of said motor.

4. In a liftingljack, a vertically disposed -hollosr cylinder, and a self-contained lifting unit vertically movable therein, said unit comprising a hollow plunger closed at its lower end and adapted to contain a lifting fluid, a pump mounted on and secured to said closed end, said pump having an intake within said plunger, an outlet discharging into said cylinder and means for preventing return ilow through said pump, said pump having a shaft extending vertically upwardv within and aligned by said plunger; a motor carried by the upper end of said plunger and having its shaft extending downwardly within and positioned by said plunger in alignment with said pump shaft, and coupling means for effecting driving engagement between said motor and said pump, said coupling means being engageable by placement of said motor and disengageable 'I having an intake within said plunger, an outletA discharging into said,- cylinder and having a shan extending vertically upward within and.

aligned `by said plunger: a release valve mounted on said end closure. and manually operable means for opening said lvalve to permit dow from'said cylinder into'said plunger; a motor carried by the upper end of said plunger and having its shaft extending downwardly within and positioned by said plimger in alignment with -said pump shaft, and coupling means for effecting driving engagement between said motor' 1 and said pump, said coupling means being en- I gageable `by placement of said motor and disengaseable by removal of said motor.

`6. In a lifting jack, a vertically disposed hollow cylinder, and a self-contained lifting unit vertically movable therein, said unit comprising a hollow plunger closed at its lower end and adapted to contain a lifting fluid, a pump mounted on and secured to said closed end,saidpump having an intake within said plunger, an outlet discharging into said cylinder `and means for preventing return flow through said pump, said pump having a shaft extending vertically upward within and aligned by said plunger; a release valve mounted on said end closure and manually operable means for opening said valve to permit ilow from -said cylinder into said plunger; a motor carried-by the' upper end of said plunger and having its shaft extending downwardly within and positioned by said plunger in alignment with said pump shaft. and

couplingmeans foreffecting driving engage- `ment between' said motor and said pump, said coupling means being engageable byplacernent of said motor and disengageable by removal of said motor.

'Lmanfangmanveruuynoiu low cylinder, and a self-contained lifting unit vertically movable therein, said unit comprising a' hollow plunger closed at the lower end and adapted to contain a lifting fluid, a pump mounted on and secured to said closed end, said pump having an intake within saidplunger and discharging into said cylinder and having a shaft extending vertically upward within, and aligned by said plunger, a motor carried by the upper end of said plunger and having its shaft positioned by said plunger in alignment with said pumpA shaft, and disengageable means connecting said pump and motor shafts.

8. In a lifting jack, a vertically disposed hollow cylinder, and a self-contained lifting unit vertically movable therein, said unit comprising a hollow plunger closed at thelower end and adapted to contain a lifting uid, a pump se cured to and forming part of said closedend, said pump having an intake within said plunger and an outlet below said closed end and discharging into said cylinder, and having a shaft extending vertically upward within and aligned by said plunger, a motor carried by the upperA end of said plunger and having its shaft positioned by said plunger in axial alignment with said pump shaft, a power connection between said pump and motor shafts, and a manually operable release valve mounted on said `end closure and connecting said cylinder and the interior of said plunger, to control release flow between the interior of ,said plunger and the exterior thereof, independently of said pump.

9. In a lifting jack, a vertically disposed hollow cylinder, a self-contained lifting unit vertically movable therein, said unit comprising a hollow plunger closed at the lower end and and having its shaft positioned by said plunger lin axial alignment with said pump shaft, and

disengageable means connecting said pump and motor shafts, whereby to permit removal and/or replacement of said motor independently of said pump. 4

10. In a lifting jack, a vertically disposed hollow cylinder,and a self-contained lifting unit vertically movable therein, said unit comprising a hollow plunger closed at the lower end and adapted to contain a lifting fluid, a pump secured to andforming part of said closed end, said pump having an intake within said plunger and an outlet below said closed end discharging into said cylinder, and having a shaft extending vertically upward within and aligned by said plunger, a motor carried by the upper endof said plunger and having its shaft positioned by said plunger in axial alignment with said pump shaft, disengageable means connecting said pump and lmotor shafts, a manually operable release valve connecting said cylinder and the interior of said plunger, to control release flow between the interior of said plunger and the exterior thereof, independently of said pump, and a check valve disposed in the discharge connection Afrom said pump to said cylinder, to prevent return flow therethrough.

LOUIS C. STUKENBORG. 

